Construction Inspection

TERRA-PETRA CONSTRUCTION INSPECTION SERVICES

All methane gas mitigation, building protection and waterproofing systems should be inspected by a certified professional with experience in these systems to assure the owner/developer that all of the elements of the approved plans, (elements which they have paid for) are properly installed and functioning. Most governing agencies, such as the City of Los Angeles will require these inspections. Additionally, many waterproofing manufacturers will also require these inspections for insurance purposes, to issue a material and/or labor warranty for their products. There is a multitude of unforeseen and unfamiliar site conditions which make these inspections prudent for all parties.

The City of Los Angeles Department of Building and Safety requires continuous inspection by a Deputy Methane Barrier Inspector (DMBI) for the installation of all subslab gravel layers and for methane barrier membranes. Terra‑Petra has a staff of 5 inspectors certified by the City of Los Angeles as DMBI Inspectors. Our inspectors hold inspection certifications from each manufacturer of methane barrier membranes which is approved under LADBS Research Report for use in the City of Los Angeles—as well as many other methane gas and waterproofing barrier systems on the market today.

Starting at the pre-construction phase our inspectors work with the governing agency, the local Building Official, the General Contractor, the product manufacturer and the subcontractors to establish an acceptable guideline for installation of the systems as well as monitoring, documenting and reporting our findings. We are instrumental in opening the lines of communication between all parties involved with the project to insure a smooth and successful installation and monitoring process.

Terra-Petra is an environmental engineering firm specializing in contaminated soil and groundwater conditions. Our expertise starts with soil gas characterization, remediation, and in the design and inspection of gas mitigation systems for buildings of all types.